The Boost Gauge is a central mechanic in Sonic Rush, allowing both Sonic and Blaze to unleash a powerful burst of speed. The gauge is located at the bottom of the screen and fills up as you perform various actions: defeating enemies, collecting rings, and performing tricks (like grinding rails or bouncing off springs). Once a segment of the gauge is filled, you can activate your Boost by pressing the X or Y button. Boosting consumes a portion of the gauge and propels your character forward at incredible speeds, destroying most enemies and obstacles in your path.
Strategic use of the Boost is crucial for achieving S-Ranks and navigating challenging sections. Don't just hold it down; learn when to activate it for maximum effect. Use it to power through enemy formations, clear long gaps, or bypass dangerous environmental hazards. Managing your Boost Gauge effectively means knowing when to conserve it and when to unleash its full power. Continuously filling it by chaining attacks and collecting rings is a key skill to master.